The Table Spread - 5:6
Believers! When you rise for prayer, wash your faces and your hands up to the elbows. Splash your head, and your feet up to the heels, and wash if you have had sexual intercourse. And if you are sick or a traveler, or you have come from the toilet, or you have had sexual intercourse with women and you cannot find water, then turn to a clean piece of earth and rub your face and arms with it. Allah does not wish to cause you any hardship. He only wants to purify you and complete His favor upon you. That you may give thanks.
What is the intention?
The Pilgrimage/22:78
And strive and strive hard for the sake of Allah. It is He who has chosen you. He has not made this religion, which is the way of your father Abraham, difficult and burdensome for you. It is He Who has called you Muslims (Muslims) before and now, so that the Messenger may be a witness to you and you may be a witness to the people. Observe the prayer and pay the zakat and cling to Allah; He is your Owner. How good the Owner and how good the Helper!